package cn.edu.swu.gyt.auth;

import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;

import java.io.IOException;

//拦截器
@WebFilter(urlPatterns = "/admin/*")
public class AuthFilter extends HttpFilter {
    public final static String LOGIN_TOKEN_KEY="LOGIN_TOKEN_KEY";

    @Override
    public void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpSession session=request.getSession(true);
        if(session.getAttribute(LOGIN_TOKEN_KEY)==null){
            response.sendRedirect("../login.html");
        }else{
            chain.doFilter(request,response);
        }

    }
}
